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science chapter 11
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Gravity
Terms in this set (38)
an object's change in position relative to a reference point.
Motion
a system for specifying the precise location of objects in space and time.
Frame of reference
Objects move when their position changes in relation to a...
reference point
measures the path taken (How far an object moves)
Distance
___ is the change of an object's position
Displacement
___ is the change in an object's position with a direction ___.
Displacement, indicator
Distance can be a straight line, but ___ must be a straight line
displacement
the distance traveled divide by the time interval during which the motion occurred.
Speed
___ is achieved when an object covers equal distance in equal amount of time. (No change in Speed)
Constant Speed
Speed can be studied in ___.
The steeper the slope the ___ speed the object possesses.
graphs, greater
___ is always the x-axis, and ___ is always the y-axis
Time, distance
___ is calculated as distance divided by time.
Average speed
___ Speed is the speed at a given point in time.
Instantaneous
___ describes both speed and direction
velocity
Velocity is the speed of an object in a ___
particular direction
___ is a combination of 2 velocities.
Resultant velocity
Plot graphs showing ___ on the vertical axis and ___ on the horizontal axis
distance, time
The slope of a distance vs. time graph equals ___.
speed
___ is the rate at which velocity changes over time; an object accelerates if its speed, direction, or both changes.
Acceleration
Uniform circular motion has ___
centripetal acceleration
Acceleration is expressed as an increase in ___ (1m/s/s) or 1m/s2. It also has a direction component.
meters per second per second
Acceleration can also be a ___.
change in direction
Acceleration can be determined from a ___ graph.
velocity vs. time
The slope of the line gives the value of ___. Positive slope increase in acceleration. Negative slope decrease in acceleration.
acceleration
an action exerted on a body in order to change the body's state of rest or motion
force
force has ___ and ___
magnitude, direction
four fundamental forces
Gravity, electromagnetic, strong nuclear force, weak nuclear force
___ forces and ___ forces can cause an object to move or stop moving
contact, field
contact force:
field force:
push a cart, Gravity
objects accelerate in the direction of the ___
net force
___ forces do not change motion
balanced
___ do not cancel completely
unbalanced forces
a force that opposes motion between two surfaces that are in contact
friction
___ friction- the force that resists the initiation of sliding motion between two surfaces that are in contact and at rest
static
___ friction- the force that opposes the movement of two surfaces that are in contact and are moving over each other
kinetic
not all ___ is the same
___ friction
___ friction
kinetic friction, sliding rolling
___ resistance also opposes motion
ex. ___
air, fluid friction
harmful friction can be reduced by the use of ___
lubricants
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